MINEBK00940

• County: Boulder
• Volume: 15
• Document: Inspectr
• Suffix: A

10
Blsok Beauty - 4. - •

•"- -~ ESPLO S IVE S-•Contin.
of powder only. Lll'other supplies are stored in•the power house.
fto dav],oe'for thawing powder has been ;jrovided.,
li I ft I ft (i & ni I WE ME T B O D S.
The main opening is s orasswut tunnel 400' in length and
timbered for a distance of:%20' Yrom the portal• with poets and oapa.
pt a distance of 176'• Prom the portal the Treasure vein ie inter-
sected. l dxi~3t;is run west on this vein' b0'" end 'a wi'rize sunk 1n
•the drift T7' : Three }iundred eighty Peet from the. portal of tho
tunnel the Ble,ok Beauty-vein Se intersected and 'drifting done on
this vein B00'west. A,oross-out has bean run from the Bleak Bean
vein to intersect the L. C. vein, a distance o3 106'.
Active work carried on at this time is as follows: drifting
on the L. C. vein; drifting on the Hleok Beauty vein; extending
the main tunnel.
~ A shaft 40' in depth on the Bleok Saeuty vein and one 36'
in depth on the L: C. vein 'ere abandoned snd in poor condition.
The method oP ore ~extraotion Se by means of overhan8 etop-
ing and drifting. fto hand'dri111ng ie done and St. Glair iiaohine
drills are employedr •
Poets and oapa in the tunnel and atolls covered vrith lag-
ging in the.drifte are the methods employed for timbering. The
~,
timbers are prepared by hnnd•from plne and apruoe, are in goofl
•..
condition and sufficient in site and number to izlsure enfety.
There are no chutes.
~..
Underground txamming is done by hand with steel oars on
a trackage of 18" gunge and 8~ T rails.
Drainage is natural se the tunnel ie driven on a uniform
grade of about 1~. The amount of water Se small and ie easily
hanfllefl. •
Ventilation le natural and sufficient and no noxious gases
are met with.
dll old timbers and debris have been removed from under-